直剪过程中砂岩渐进损伤及渗透演化的离散元模拟

doi:10.13722/j.cnki.jrme.2023.0122

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Abstract In order to investigate progressive damage and permeability evolution of sandstone under direct- shearing conditions，a group of numerical models based on physical experiments are established using the particle flow code in two-dimension(PFC2D). Four different levels of normal stresses are set to discuss meso-crack propagation features，energy dissipation mechanism，and permeability evolution characteristics of sandstone in the process of direct-shearing. The results show that the mesoscopic cracks gradually expanding，merging，connecting，nucleating，and finally forming an obvious macroscopic shear band，and the total number of cracks after failure increases with the increase of the normal stress. In addition，the total energy input in the pre-peak stage is mainly stored in the form of the strain energy of interparticle bonding bonds，and the dissipated energy increases rapidly in the post-peak stage. The dissipated energy is close to 40% of the total energy when the numerical rock samples fail completely. Furthermore，the permeability variation is governed by the preferred seepage channels in the rock sample，and the sudden increase of permeability is the manifestation of the transformation of“pore flow”into“fracture flow”during direct shearing process.

Key words： rock mechanics direct-shear test progressive damage permeability evolution particle flow code discrete element method

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	Articles by authors
	CHEN Xu1
	2
	YU Feiyang2
	TANG Minggao1
	2
	XIAO Yi2
	ZENG Peng1
	2
	ZHONG Zhibin1
	2

Cite this article:

CHEN Xu1,2,YU Feiyang2, et al. DEM simulation of progressive damage and permeability evolution of sandstone during direct-shearing[J]. , 2024, 43(S1): 3161-3174.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0122 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/IS1/3161

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